I created a post with 8 images attached. I wanted to modify the title of some of the images so I went to Media Gallery from my profile and used the Edit button on those images. When I went back to the activity stream, only one image was attached to the post. I deleted the post and repeated the whole process and the same thing happened.
PHP: 5.4.42
MYSQL: 5.1.56
WordPress: 4.2.2
BuddyPress: 2.3.2.1
rtMedia: 3.8.10
OS: Linux
Imagick: 6.6.9-7 2014-03-06 Q16
GD: bundled (2.1.0 compatible)
post_max_size: 65M
upload_max_size: 64M
memory_limit: 256M
Installed Plugins: rtMedia for WordPress, BuddyPress and bbPress by rtCamp version 3.8.10,
BuddyPress by The BuddyPress Community version 2.3.2.1,
InfiniteWP - Client by Revmakx version 1.3.15,
Jetpack by WordPress.com by Automattic version 3.6 (only Protect module is enabled)
Theme Name: rtPanel
Theme Version: 4.1.6